{"id":1194,"date":"2021-03-19T16:25:00","date_gmt":"2021-03-19T08:25:00","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/java\/?p=1194"},"modified":"2021-03-19T16:29:04","modified_gmt":"2021-03-19T08:29:04","slug":"classpath%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/java\/post-1194.html","title":{"rendered":"classpath\u662f\u4ec0\u4e48?"},"content":{"rendered":"\n

classpath\u5728\u666e\u901a\u7684 java \u5de5\u7a0b\u4e2d, \u53ef\u80fd\u6ca1\u4ec0\u4e48\u4f5c\u7528, \u4f46\u5728web\u5de5\u7a0b\u4e2d\u5fc5\u987b\u8981\u7406\u89e3<\/p>\n\n\n\n

classpath \u529f\u80fd\u7c7b\u4f3c\u4e8e “\u7cfb\u7edf\u53d8\u91cf\u7684path”, \u73af\u5883\u53d8\u91cf\u7684 path \u4f5c\u7528\u662f\u5728\u5f53\u524d\u76ee\u5f55\u4e0b\u627e\u4e0d\u5230\u8d44\u6e90\u65f6, \u5c31\u4f1a\u53bbpath\u53d8\u91cf\u4e0b\u7684\u76ee\u5f55\u67e5\u627e, \u800c classpath \u662f\u5f53 class \u6587\u4ef6(\u6216\u914d\u7f6e\u6587\u4ef6)\u627e\u4e0d\u5230\u65f6,\u5c31\u9ed8\u8ba4\u67e5\u627e class \u4f4d\u7f6e, \u8fd9\u6837\u5c31\u80fd\u627e\u5230 class \u5566<\/p>\n\n\n\n

\u4e0b\u9762\u8bb2 2 \u4e2a\u4f8b\u5b50\u7406\u89e3\u5b83\u6709\u4ec0\u4e48\u7528.<\/p>\n\n\n\n

jsp\u4e2d\u4f7f\u7528 classpath \u627e\u5230\u67e5\u627eclass<\/h5>\n\n\n\n

jsp \u6587\u4ef6\u53ef\u4ee5\u4f7f\u7528 import \u6307\u4ee4\u5bfc\u5165\u4e00\u4e2a\u7c7b, \u6bd4\u5982 UserDao, UserDaoImpl<\/p>\n\n\n\n

<%@ page import=\"dao.UserDao\" %>\n<%@ page import=\"dao.impl.UserDaoImpl\" %><\/code><\/pre>\n\n\n\n
\u8fd9 2 \u4e2a\u8def\u5f84\u662f\u76f8\u5bf9 classpath \u7684\u8def\u5f84, \u800c\u4e0d\u662f jsp\u9875\u9762\u6240\u5728\u5305\u4e0b\u7684\u8def\u5f84, \u4ece\u672a\u7f16\u8bd1\u7684\u76ee\u5f55\u7ed3\u6784\u4e2d, \u4f60\u600e\u4e48\u4e5f\u770b\u4e0d\u51fa\u6765\u5b83\u662f\u8fd9\u4e2a\u76ee\u5f55.<\/p>\n\n\n\n
\u666e\u901a\u7684 web \u5de5\u7a0b\u4e2d, \u7f16\u8bd1\u540e\u5176\u5b9e\u4f1a\u5728 \/WEB-INF\/classes \u76ee\u5f55\u4e0b, \u5982\u679c\u9700\u8981\u6307\u5b9a\u5b57\u8282\u7801\u6587\u4ef6, \u52a1\u5fc5\u5199\u4e0a\u6b64\u76ee\u5f55<\/p>\n\n\n\n
jsp\u6216servlet\u4f7f\u7528 classpath \u52a0\u8f7d\u914d\u7f6e\u8d44\u6e90<\/h5>\n\n\n\n
\u5f53\u524d\u5de5\u7a0b\u4e2d, \u6709\u4e00\u4e2a servlet, \u4e0d\u8fc7\u6b64\u65f6\u4f7f\u7528\u7684\u662f maven \u7684\u5de5\u7a0b, \u6211\u7684 servlet \u662f\u5728 main\\java\\util \u5305\u4e0b<\/p>\n\n\n\n
\u914d\u7f6e\u6587\u4ef6, \u5728 main\\resource \u5305\u4e0b\u7684 druid.properties \u6587\u4ef6<\/p>\n\n\n\n
\u4f60\u4e0d\u53ef\u4ee5\u4f7f\u7528 ..\/..\/resource\/druid.properties \u8fd9\u6837\u7684\u5199\u6cd5, \u8fd9\u662f\u884c\u4e0d\u901a\u7684, \u8fd9\u662f\u56e0\u4e3a\u5f53\u524d\u663e\u793a\u7684\u662f\u7f16\u8bd1\u524d\u7684\u7ed3\u6784, \u5b9e\u9645\u4e0a\u7f16\u8bd1\u540e\u7684\u4f4d\u7f6e, servlet\u4f4d\u7f6e\u662f target\/classes\/util , \u800c\u914d\u7f6e\u6587\u4ef6\u7684\u4f4d\u7f6e\u662f target\/classes\/druid.properties<\/p>\n\n\n\n
\u5df2\u77e5 classpath \u5c31\u662f target\/classes ,\u6545\u6211\u4eec\u5e94\u8be5\u8fd9\u4e48\u5199<\/p>\n\n\n\n
getclass().getClassLoader().getResourceAsStream(\"druid.properties\");<\/code><\/pre>\n\n\n\n
\u90a3\u4e48\u5f88\u663e\u7136, \u666e\u901a\u7684web\u5de5\u7a0b\u7f16\u8bd1\u540e \u548c maven \u7f16\u8bd1\u540e\u7684\u4f4d\u7f6e\u4e0d\u4e00\u6837, \u6211\u4eec\u4e0d\u53ef\u4ee5\u76f4\u63a5\u6309\u7167\u7f16\u8bd1\u524d\u7684\u7ed3\u6784\u67e5\u627e class \u6587\u4ef6\u6216\u914d\u7f6e\u6587\u4ef6, \u800c\u662f\u5e94\u8be5\u4e86\u89e3 classpath \u7684\u4f5c\u7528.<\/p>\n\n\n\n
\u67e5\u627e class \u6216 \u914d\u7f6e\u6587\u4ef6\u7684\u901a\u7528\u65b9\u6cd5<\/h5>\n\n\n\n
\u4f60\u5fc5\u987b\u8981\u77e5\u9053\u7684\u662f, \u65e0\u8bba\u662f class \u6587\u4ef6\u8fd8\u662f \u914d\u7f6e\u6587\u4ef6, \u90fd\u53ef\u4ee5\u901a\u8fc7\u914d\u7f6e classpath \u53d6\u5f97<\/p>\n\n\n\n
\u5f53 class \u6216 \u914d\u7f6e\u6587\u4ef6\u5b58\u5728 classpath \u6240\u5728\u7684\u76ee\u5f55\u4e0b\u65f6, \u5c31\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u76f8\u5bf9\u8def\u5f84\u83b7\u53d6<\/p>\n\n\n\n
\u53ef\u4ee5\u4f7f\u7528 getClass().getClassLoader().getResourceAsStream(“\u76f8\u5bf9\u4e8eclasspath\u7684\u8def\u5f84”) \u83b7\u53d6 class \u6587\u4ef6\u6216 \u914d\u7f6e\u6587\u4ef6<\/p>\n","protected":false},"excerpt":{"rendered":"
classpath\u5728\u666e\u901a\u7684 java \u5de5\u7a0b\u4e2d, \u53ef\u80fd\u6ca1\u4ec0\u4e48\u4f5c\u7528, \u4f46\u5728web\u5de5\u7a0b\u4e2d\u5fc5\u987b\u8981\u7406\u89e3 classpat… \u7ee7\u7eed\u9605\u8bfb classpath\u662f\u4ec0\u4e48?<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/1194"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/comments?post=1194"}],"version-history":[{"count":3,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/1194\/revisions"}],"predecessor-version":[{"id":1198,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/1194\/revisions\/1198"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/media?parent=1194"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/categories?post=1194"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/tags?post=1194"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}